Apparatus for extracting precious metals.



No. 741,189. PATENTBD 00T. 13, 19113.

H. H. THoMPS0N.

APPARATUS FOR BXTRAGTING PRECIOUS METALS.

APPLOIION FILED JULY 11, 1903.

No MODEL. 4 SHEETS-SHEET 1.

Zfa

No. 741,189. PATENTED OCT. 13, 1903. H. H. THOMPSON.

APPARATUS POR EXTRAGTING PRECIOUS METALS. APPLICATION FILED JULY 11.1903.

.N0 MODEL. 4 SHEETS-SHEET Z.

IWW? j No. 741,189. PATBNTBD OOT. 13, 1903. H. H. THOMPSON.

APPARATUS FOR BXTRAGTING PREGIDUS METALS.

APPLIOATION Hmm JULY 11. 190s.

No MODEL. 4 SHEETS-SHEET s.

QM/ggg gm..

PATENTED OCT. 13,4 1903.

Nol 741,189.

H. H. THOMPSON'. APPARATUS FOR EXTRAGTING PRECIOUS METALS.

APPLIOATION FILED JULY 11, 1903.

4 SHEETS-SHEET 4.

N0 MODEL.

No. Mince.

NrTnD i STATES ratenteu october 1s, 190s;

HENRY n. THOMPSON, OF oHURcnvILLE, New YORK;

-nirwana/tros FOR EXTRACTING PRECIOUS ivre-mts;

SPECIFICATION forming part of Letters Patent No. 741,189, dated October13, 193.

Application filed .Tuly 11l 1903. Serial No. 165,176. (No model.)

.Toa/ZZ whom it Wto/,y concern.-

Be it known that I, HENRY H. THOMPSON, a citizen of the United States,residing at Churchville, in the county of Monroe and State of New York,have invented new and useful Improvementsfin Apparatus for EX- tractingPrecious Metals, of which the following is a specification.

This invention relates to a certain new and useful improvement inapparatus for extracting precious metals.

My invention has principally for its object the construction of anAapparatus adapted to extract gold from ores; but it may be used forobtaining silver from its ores when found in combination with gold oralone.

According to the method now generally employed in the recovery of goldand silver' from their ores by means of solvent solutions of potassiumcyanid, the sand or the ores, the latter being first crushed to the sizedesired, are placed in large vats or tanks and then flooded or saturatedWith a solvent solution and allowed to stand and leach until thesolution has eaten out or extracted a greater or less percentage of thevalues of the ores or the sand. The solution is then drained or drawnout through the bottom of the tank, and the gold or silver that is heldin solution is then precipitated by means of zinc or other methods ofrecovery. Experience and chemistry have shown that the chemical activityof a solvent solution of potassium cyanid in the extraction ofV gold orsilver depends largely upon the amount of oxygen present during theleaching process.

Various attempts to furnish artificial oxygen have been made by addingother chemicals-such as permanganate of potash, ferricyanid ofpotassium, dto-to the solventsolution potassium cyanid. It has also beenproven that the presence of an increased supply of oxygen notvonlyincreases the chemical activity of the potassium cyanid during theleaching process, but that a much larger quantity of the potassiumcyanid is used up.

One ot' the objects of my invention is to provide new and novel means sothat the cyanid solution will be fed to the receptacle accompanied bycompressed air, thereby providing thenecessary amount of oxygen, consrquently overcoming the objection of insufficient oxygen heretoforeexisting in methods or apparatus generally employed for the extractionof gold and silver from ores.

, A further object of the invention is to provide new and novel meansfor washing the leached ore, so that when the leaching is cornpleted thecyanid solution which has not overfioWed can be entirely drawn off.

The invention further aims to provide an apparatus of this character bywhich the supply of compressed air and cyanid solution can be diminishedorincreased at the option ofthe operator; that will enable the supply ofthe cyanid solution and compressed air to the apparatus to be madethrough a combined compressed air and cyanid nozzle, which projects intothe receptacle containing the material to be treated; to supply thecyanid so# lution and compressed air separately or combined to supplythe cyanid solution and compressed air under pressure, and to providesuitable means for catching the overflow of cyanid solution from thereceptacle containing the material to be treated, so 'that the saidoverflow can be conducted to a suitable means and the gold or silverprecipitated.

The invention further aims to provide an apparatus of this characterwith means whereby the treated material can be thoroughly washed anddischarged from the receptacle containing it by gravity and thesupplying of the Washing liquor through the combined compressed-air andcyanid nozzle.

The invention further aims to construct an apparatus of this characterwith new and novel means for feeding the cyanid solution, compressedair, and Washing solution separately or combined, as desired.

A further object of the invention is to provide new and novel means forthoroughly agitating the material while it is subjected to the cyanidsolution and compressed air, and thereby insure a thorough action of thesolution upon the material.

The invention further aims to construct an apparatus for the purpose setforth which shall be simple in its construction, strong, durable,efficient in its use, and comparatively inexpensive to set up.

With the foregoing and other objects in view the invention consists ofthe novel combination and arrangement of parts hereinafmeans for thesolution.

ter more specifically described, illustrated in the accompanyingdrawings, and particularly pointed out in the claims hereunto appended.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, whereinlike reference characters denote corresponding parts throughout theseveral Views, and in which- Figure 1 is a top plan View of theapparatus. Fig. 2 is a side elevation thereof. Fig. 3 is a sectionalelevation thereof. Fig. 4 is a sectional detail of the upper portion ofthe agitator-arms and other suspension means. Fig. 5 is a side elevationof one of the agitator-arms. Fig. 6 is a perspective view of one of theagitator-arms. Fig. 7 is a perspective View of one of the spacing andstop collars for the agitator-arms. Fig. 8 illustrates crosssectionsofthe agi Later-arms. Fig. 9 is a sectional detai'l of one of thescreened nozzles for the feed-pipe. Fig. 10 is a detail of the couplingsby which the cyanid, compressed air, or water is introduced to theauxiliary supply-pipes. Fig. 11 is a sectional eleva-tion of Fig. 10.

Referring to the drawings by reference characters, 1 denotes a tank orreceptacle which is adapted to receive the material to be operated upon,such as any gold-bearing substance. The tank or receptacle 1 is open atits top and is provided with a closed bottom 2, substantially in theform of an inverted cone, which is provided centrally with an outlet 3.The tank or receptacle 1 is stationary and, as shown, is substantiallycylindrical in contour; but any preferred shape may be employed. Theouter face of the tank or receptacle 1 has attached thereto a series ofshort angle-irons 4, which are adapted to rest upon any suitable meansfor supporting the apparatus in an upright position. Other means thanthat as shown for retaining` the apparatus in an upright position'can beemployed. Surrounding the tank or receptacle 1, near the top thereof,and arranged a suit'- able distance from the outer face of the tank orreceptacle 1 is a shell 5, connected at its lower end to the tank orreceptacle 1 by an annular plate 6, provided with outlets 7. The shell 5extends a suitable distance above the top edge of the tank or receptacle1 and is in connection therewith, and the plate 6 forms anoverliow-compartment 8 for the cyanid solution, the latter beingdischarged therefrom through the outlets 7, which are adapted to beconnected to any suitable separating The top of the shell 5 has securedthereto an annular angle-iron 9, forming a support for a pair of I-beams10 11. These'latter are adapted to support the operating mechanism forthe agitator-shaft, both of which will be hereinafter referred to.

Communicating with the outlet 3 ofthe conical bottom 2 is adischarge-pipe 12 for the solution which remains in the tank or recep-rtacle 1 after the material has been treated and also for the dischargeof the treated material. The discharge-pipe 12 near its junction withthe conical bottom 2 is provided with an adjustable screen 13, its meshbeing such as to prevent the passage of the material therethrough, butto permit of the passage of the solution. The screen 13 is carried by aslidable support 14, operatingin a casing 16, which carries the support14. The latter has connected thereto at one-end a handle 17, so that thescreen 13 can be readily removed from its position within the pipe 12,as well as replaced. The casing 16 is arranged between two sections ofthe pipe 12 and also forms a coupling for connecting the two sections ofsaid pipe together.

Arranged within the tank or receptacle 1 is a series of agitating-arms,which are adapted to agitate the material when moving in one direction,but assume an inoperative position when moving in a counter direction.The agitator-arms are suspended from a vertically-extending shaft 18,rotatablysupported at its lower end within the tank or receptacle 1 andat its upper end by the bearing 15, arranged between and secured to theI- beams'lO and 11 centrally of the apparatus. The shaft 18 is rotatablysupported at its lower end within the tank or receptacle 1 by means ofan abutment-block 19, which extends into the lower end of the shaft 18and is provided at its top with a vertical projection 20, surrounded bythe bearing-balls 2l. The shaft 18 at its lower end is suitablyrecessed, so that it will tit closely, but permit of rotating around theabutment-block 19. The shaft 18 when set up rests upon the bearing-balls21. The abutment-block 19is supported within the tank or receptacle 1 bymeans of the inclined legs 22, secured at their lower ends to the innerface of the conical bottom 2 and at their upper ends to the block 19.Extending within the recessed end of the shaft 18 and surrounding theblock 19 is a gland 23, between which and the shoulder 24, formed in thewall of the recesses in the end of the shaft 18, is arranged a suitablepacking to prevent foreign matter entering the upper part of therecessed portion of the shaft 18. rl`he gland 23 is adjustably connectedto the shaft 18 by means of the bolts 25, extending through the lugs 26on the shaft 18 and the screw-threaded lugs 27 on the gland 23.

Connected to the shaft 18, near the top thereof, as at 28 29, is av pairof radially-extending supporting-arms 30 31, respectively. Each of thearms 30 3l has loosely mounted thereon a series of hangers 32, providedon each side with a laterally-extending ear 33 and recessed in theirbottom to receive the upper end of the agitator-arms 34, Which aresecured to the hangers by the set-screws 35.

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The agitator-arms 34 are substantially dia- 1 mond-shaped incross-section for the purpose hereinafter referred to. Fixedly secured,by means of the set-screws 36, upon the arms 30 31 is a series ofspacing and stop collars 37 37 for the hangers 32 and between which thef hangers are arranged. Each end of the collars 37 37' is cut away, asat 38, to form the shoulders 39 40, the shoulder 39 being arrangedsubstantially at an angle of ninety degrees and the shoulder40substantially at an angle of one hundred and eighty degrees. The collars37 and 37 are secured, respectively, to the arms 30 and 3l in such amanner that when the shaft 18 is rotated in one direction theagitator-arms 34 will ne rigid, consequently agitating the materialwithin the tank or receptacle l, and when the shaft 18 is rotated in theopposite direction the agitator-arms 34 will be moved from theirvertical position, and consequently the material will not be agitated.This action is caused by the engagement of the ears 33when the shaft 18is rotated in one direction with the shoulders 40, owing to the factthat the material will offer a resistance to the arms 34, causing theears 33 of the hangers 32 to bear against the shoulders 40; but when theshaft 18 is rotated in an opposite direction, there being nobearing-surface for the ears 33 to retain the hangers 32 and arms 34 inan upright position, the material will cause the agitatorarms and thehangers to swing upwardly until their movement will be arrested by theshoulder 39. Consequently the hangers 32 and arms 34 will extend at suchan angle that their function of agitating will be lost, but immediatelywhen the shaft is rotated in an opposite direction the agitator-arms 34will be caused to assume a vertical position, owing to the action of theears 33 bearing against the shoulders 40, and the arms 34 will beretained in such position and agitato the material until the movement ofthe shaft is reversed or stopped. As before stated, the arms 34 arediamond-shaped in cross-section, so that such shape will assist the saidarms in cutting through the material when the arms 34 are retained intheir upright position. To further assist in agitating the material whenthe shaft 18 is rotated in the direction which causes the agitatonarms34 to remain in this upright position, the lower ends of each of thearms 34 carries an agitating-chain 41. It will be evident that when thearms 34 are rapidly revolved in their operating position and carry thechains 41 therewith the latter, owing to their flexibility, will alsomaterially assist in agit-ating the material. The agitator-arms 34 areof a different size, grad ually diminishing in length-that is to say,the

t outer arm being shorter than the adjacent in- One end of theworin-shaft 43 projects from the -beam 10 and carries the fixed driving-Y ed onto the pulley 45 to connect it to the prime mover it will causethe worm-shaft 43 to revolve in such a manner so as to rotate the shaft18 in an opposite direction to that direction imparted to the shaft 18by the shaft 43 when the belt 48 is shifted upon the pulley 45 forconnecting it to the prime mover. The loose pulleys 46 are of such awidth that both belts can be shifted so they will not engage the pulley45, thereby discontinuing the operation of the apparatus. The referencecharacter 49 denotes the shiftingrod for the belts 47 and 48. The rod 49is supported by the -beams 10 and 11 and is provided with two pairs ofvertically-extending studs 50` 51 for the belts 47 and 48, respectively.It will be evident that by shifting the rod 49 the belts 47 and 48 canbe shifted as desired upon the pulley 45, so that the proper rotationcan be imparted to the shaft 18, and, furthermore, the belts 47 and 48can be so shifted as not to engage the pulley 45 for the purposeheretofore set forth.

The cyanid solution, compressed air, and water are supplied to the tankor receptacle 1 separately or combined by means of the feed-pipes 52,which communicate with the tank or receptacle 1 through the medium ofthe nozzles 53, connected to the bottom 2. These nozzles 53 are attachedto the upper end of the feed-pipes 52 by means of the couplings 54 andare each provided with a iiaring mouth 55, having extending across thesame a screen 56, connected to the nozzle by means of the screws 57 orother suitable device. The mesh of the screens 56 is such as to permitof the passage therethrough of the cyanid solution or the water, as wellas the compressed air, but will arrest the passage of the material' tothe feed-pipe 52. The nozzle 53 is provided with an enlarged dischargeend, which is cut away so as to conform to the inclination of the bottom2. This cutting away of the enlarged discharge end of the nozzle 53forms a shoulder 58, adapted to rest upon the inner face of the bottom,but preferably to form a water-tight joint between the shoulders 58 andinner face of the bottom 2 a suitable packing is interposed, as at 59.The bottom 2 is pro` vided with an 'opening to permit of the eX- tendingtherethrough of that portion of the nozzle of smaller diameter. Each ofthe nozzles 53 is secured in position by means of a collar 60 abuttingagainst the lower face of the bottom 2, the upper face of the collar 60being constructed to conform to the shape of the bottom 2 for suchpurpose and which is retained'in position by'means of the set-nut 62,

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which engages the screw-threads 61 of the nozzle against the collar 60.Y The feed-pipes 52 near their juncture with the nozzles 53 areshouldered, as at 63, so that when the coupling 54is screwed homethenozzles 53 and feedpipes 52 will be securely clamped together.

Arranged below the bottom 2 of the tank or receptacle 1 are theauxiliary supply-pipes 64, two of which are preferably employed and towhich the lower ends of the feed-pipes 52 are connected. The feed-pipes52 have portions of their length bent in a curvilinear manner and theremaining portions in a vertical manner, so that the cyanid solution,water, or air will be fed in a vertical manner to the tank orreceptacle 1. By this arrangement only two auxiliary supply-pipes arenecessary. The auxiliary supply-pipes 64 extend in a horizontal mannerthe major portion of their length, are closed at one end, and at theirother end are bent toward each other and connected to one end of the Y-shaped coupling 65, as at 66. The other end of the coupling 65 isconnected by a branch pipe 68 with one end of a Y-shaped coupling 69.This latter coupling has connected thereto, as at 70, acyanid-solution-supply pipe 71, provided with the cut-oft' 72, the pipe7l being in communication Wit-h acyanid-solutionsupply. (Not shown.) Thecoupling 69 is also connected, as at 72, with a water-supply pipe 72b,provided with a cut-off 72. The pipe 72b is also in communication with awater-supply. (Not shown.) The cyanid solution and Water are supplied tothe apparatus. under pressure. Any suitable means may be employed forthis purpose. The top of the coupling 65 is provided with a pair ofdiverging openings 72d, which depend downwardly at an inclination andextend in the same direction as the bent ends oftheauxiliarysupply-pipes 64. Mounted upon the top of the coupling 65 is acasing 72e, which forms, in connection with the top wall of the coupling65, a compressed-air chamber 72f. The casing 72e is connected to thecoupling 65 in any suitable manner. Connected to one wall of the casing72e and communicating with the compressed-air chamber 72" is acompressedair-supply pipe 72g, provided with a cut-off 72h. The pipe 72gis in communication with a suitable compressed-air supply. The cutoffs72, 72C, and 72h are adapted to control the cyanid-solution supply,water-supply, and compressed-air supply, respectively, either separatelyor in any preferred combination. By extending the openings 72d in thetop wall of the coupling 65 in a diverging manner, or so that theopenings will extend in the same direction as the auxiliary supply pipes64, the compressed air and cyanid solution will be evenly distributedwhen they are supplied to the receptacle.

The coupling 65 has depending therefrom a trap 73, closed by means ofthe gate 74. The trap 73 is adapted to receive any of the material whichmight pass through the screens 56 during the discharge of the cyanidfrom the tank or receptacle 1 afterthe ore is treated. The trap 73 alsocommunicates with the discharge-pipe 12 by means of the inclined pipe75, which is provided with a cut-off 76. This discharge-pipe 12 willpermit of the draining oif of any of the cyanid solution remaining inthe nozzles 53, feed-pipes 52, auxiliary supply-pipes 6%, coupling 65,and trap 73 after the material has been treated. Communicating with thedischarge-pipe 12 is a draw-off pipe 77, having a cut-off 78, and whichis adapted to draw off the cyanid solution which remains in the tank o1'receptacle 1, pipe l2, coupling 65, and trap 73 after the material hasbeen treated, as Well as prior to the discharge of the material. Thepipe 77 may be connected to a suitable pump to assist in the withdrawingof the cyanid solution. The discharge-pipe 12 is provided with agate-valve 79, which when open and the screen 13 withdrawn will permitof the treated material being discharged from the tank or receptacle 1,as it will be evident that owing to the conical bottom 2 of the tank orreceptacle 1 the material will flow by gravity out through the outlet 3into the discharge-pipe 12, from where it can be conducted to anysuitable point.

The operation of the apparatus is as follows: The material to be treatedis delivered in any suitable manner into the tank or receptacle 1 to asuitable level. The cyanid solution and compressed air are thenintroduced into the tank or receptacle 1 through the medium of thenozzles 53 and feed-pipes 52, the cutoffs 72 and 72h being opened topermit of the pa-ssage of the solution and air from their supply throughthe couplings 65 69, branch pipe 67, supply-pipes 7l 72g, feed-pipes 52,and nozzles 53. The cyanid solution and compressed air'are supplied tothe tank or receptacle 1 in such a manner as to make the ore or sandboil up, and at this stage the shaft 18 is rotated in such a manner thatthe agitator-arms will rise or be elevated and the chains 41 stir thetop of the material. This operation of the shaft 1S is only for a fewminutes, in fact, suflicient to stir the top of the material, so thatthe cyanid can thoroughly act thereon. The motion ofthe shaft 18 is thenreversed and the agitator-arms 34E caused to assume their verticalposition, and as the shaft 1S rotates the arms 3a and chains 41 willthoroughly agitate the material during the leaching thereof. The upwardleaching of the cyanid solution through the material causes a thoroughpermeation of the mass and absorption of the metals desired to beseparated. The action of the cyanid solution will be materially assistedby the presence of the necessary amount of oxygen, 4 which is obtainedby the supplying of the compressed air simultaneously with the feedingof the cyanid solution, the solution and air being fed under pressure,and the material is thoroughly agitated in the manner as here- IIOinbefore set forth during the leaching thereof by the solution. Theovertlowingcyanid so lution carrying the gold and silver, for example,is collected into the overflowfchamber 8,from where it is dischargedthrough the outlets 7 and conducted in any suitable manner to theseparating apparatus to precipitate the metals from the solution. Aftera thorough leaching in the manner as set forth the supply of thesolution and air is discontinued by closing the cut-offs 72 and 72g. Thecyanid solution remaining in the tank is drawn off by means of openingthe cut-off 76 of the pipe 75 and the cut-off 7S of the pipe 77. To thelattera suction device may be attached. The backflow of the solutionwill be through the outlet 3 into the pipe 12. From the latter thematerial will be discharged through the pipe 77, where it is conductedto a suitable separating apparatus. The solution will also flow backwardthrough the nozzle 53, feedpipes 52, auxiliary supply-pipes 64:,coupling 65, trap 73, pipe 75, and into pipe 12, from whence it isdischarged through the pipe 77. During the exhausting of the solutionfrom the tank or receptacle 1 the screen 13 extends across the pipe 12to prevent the material entering the same. The gate-Valve 79 remainsclosed when the solution is exhausted to prevent the discharge of thematerial throughsaidpipe12. Duringthewithdrawal of the 'cyanid solutionthe operation of the shaft 18 is discontinued. After the solution isremoved the cut-offs are closed and the material is washed and loosenedup by the supplying of water to the tank or receptacle 1 through thenozzles 53, feed-pipe 52, auxiliary supply-pipe G4, couplings 65 69, andwater-pipev72b, the cut-off 72C being open for such purpose. After asufficient quantity of water is supplied, the shaft 18 is slowlyrotated, which in connection with the water thoroughly loosens thematerial or causes the materialtoassumealiquidstate. The screen 13 isthen removed Vand the gate-valve 79 opened, which permits the materialto discharge itself by gravity from the tank or receptacle 1 through theoutlet 3 of the bottom 2 into the pipe 12, where it is conducted to anysuitable point. The shape of the bottom 2 permits of the tank orreceptacle l emptying itself by gravity.

It is thought the many advantages of my improved apparatus forextracting precious metals from ores or sand can be readily understoodfrom the foregoing description, taken in connection with theaccompanying drawings, and it will furthermore be evident that changes,variations, and modifications can be resorted to Without departing fromthe spirit of the invention or sacrificing any l of its advantages, andI therefore do not wish modifications as come properly within the scopeof the protection prayed.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. An apparatus for extracting precious metals comprising a receptacle,a series of nozzles communicating therewith, and means for supplying acyanid solution, compressed air and water to cach of said nozzles eitherseparately or in any preferred combination.

2. An apparatus for extracting precious metals comprising a receptacle,a series of nozzles extending through and connected to the bottom ofsaid receptacle, said nozzles communicating with the interior of saidreceptacle, and means for supplying a cyanid solution, compressed airand water to each of said nozzles either separately or in any preferredcombination.

3. An apparatus for extracting precious metals comprising a receptacle,a series of screened nozzles communicating therewith, and means forsupplying a cyanid solution, compressed air and Water to each of saidnozzles either separately or in any preferred combination.

4. An apparatus for extracting precious metals comprising a receptacle,a series of screened nozzles extending through and connected to thebottom of said receptacle, said nozzles communicating with the interiorof said receptacle, and means for supplying a cyanid solution,compressed air and water to each of said nozzles either separately or inany preferred combination.

5. An apparatus for extracting precious metals comprising a receptacle,acouipling, a series of nozzles communicating with said receptacle andconnected with said coupling, and pipes for supplying a cyanid solution,compressed air and water communicating with said coupling.

6. An apparatus for extracting precious metals comprising a receptacle,a coupling, a series of nozzles extending through and connected to thebottom of said receptacle, said nozzles further connected to saidcoupling and communicating with the interior of said receptacle, andpipes for supplyinga cyanid solution, compressed air and watercommunicating with said coupling.

7. An apparatus for extracting precious metals comprising a receptacle,a coupling, a series of screened nozzles projecting in said receptacle,communicating therewith and connected with said coupling, and pipes forsupplying a cyanid solution, compressed air and watercommnnicating withsaid coupling.

8. An apparatus for extracting precious metals comprising a receptacle,a coupling, a

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series of screened nozzles extending vthrough and connected to thebottom of said receptacle, said nozzles further connected to saidcoupling and communicating with the intelior of said receptacle, andpipes for supplying a cyanid solution, compressed air and watercommunicating with said coupling.

9.v An apparatus for extracting precious metals comprising a receptacle,a coupling, a series of nozzles communicating With said receptacle andconnected with said coupling, pipes for supplying a cyanid solution,compressed air and Water communicating with said coupling, and means forcontrolling said pipes to conjointly supply the cyanid solntion andcompressed air and separately supply the Water to each of said nozzles.

10. An apparatus for extracting precious metals, a coupling, a series ofnozzles extending through and connected to the bottom of saidreceptacle, said nozzles f urtherconnected to said coupling andcommunicating With the interior of said receptacle, pipes for supplyinga cyanid solution, compressed air and Water communicating with saidcoupling, and moans for controlling said pipes to conjointly supply thecyanid solution and compressed air and separately supply the water toeach of said nozzles. v

11. An apparatus for extracting precious metals comprising a receptacle,a coupling, a series of screened nozzles communicating with saidreceptacle and connected With said coupling, pipes for supplying acyanid solution, compressed air and Water com municating with saidcoupling,and means for controlling said pipes to conjointly supply thecyanid solution and compressed air and separately supply the Water toeach of said nozzles.

12. Anapparatus for extracting precious metals comprising a receptacle,a coupling, a series of screened nozzles extending through and connectedto the bottom of said receptacle, said nozzles further connected to saidcoupling and communicating with the interior of said receptacle, pipesfor supplying a cyanid solution, compressed air and water communicatingWith said coupling,and means for controlling said pipes to conjointlysupply the cyanid solution and compressed air and separately supply thewater to each of said nozzles.

13. An apparatus for extracting precious metals comprisinga receptacle,aseries of nozzles projecting therein and communicating therewith, meansfor supplying a cyanid solution, compressed air and water to each ofsaidpipes either separately or in any preferred combination, and anagitating means arranged Within and supported by the top of saidreceptacle.

14. An apparatus for extracting precious metals comprisinga receptacle,aseries of nozzles extending through and connected to the bottom of saidreceptacle, means for supplying a cyanid solution, compressed air andWater to each of said nozzles either separately or in any preferredcombination, and an agitating means arranged within and supported by thetop of said receptacle.

15. An apparatus for extracting precious metals comprising a receptacle,a series of screened nozzles extending through and conl nected to thebottom of said receptacle, means for supplying a cyanid solution,compressed air and water to each of said nozzles either separately or inany preferred combination, and an agitating means arranged Within andsupported by the top of said receptacle.

16. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedwith au outlet, a series of nozzles projecting in said receptacle andcommunicating therewith, and means for supplying a cyanid solution,compressed air and Water to each of said nozzles eitherseparately or inany preferred combination.

17. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an oVerioW-compartment providedWith an outlet, a series of nozzles extending through and connected tothe bottom of said receptacle, and means for supplying a cyanidsolution, compressed air and water to each of said nozzles eitherseparately or in any preferred combination.

18. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedwith an outlet, a series of screened nozzles extending through andconnected to the bottom of said receptacle, and means for supplying acyanid solution, compressed air and Water to each of said nozzles eitherseparately or in any preferred combination.

19. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedwith an outlet, a series of nozzles extending through and connected tothe bottom of said receptacle, means for supplying a cyanid solution,compressed air and Water to each of said nozzles either separately or inany preferred combination, and an agitating means arranged Within andsupported by the top of said receptacle.

20. An apparatus for extracting precious metals comprising a receptaclehaving its upperportion surrounded by an oVerfioW-compartment providedWith an outlet, a series of screened nozzles projecting in saidreceptacle and communicating therewith,means for supplying the cyanidsolution, compressed air and Water to each of said nozzles eitherseparately or in any preferred combination, and an agitating meansarranged within and supported by the top of said receptacle.

2l. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedwith an outlet, a coupling, a series ot` nozzles communicating with saidreceptacle and connected with said coupling,

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metals comprising a receptacle having its u pper portion surrounded byan overflow-compartment provided With an outlet,a coupling, aseries ofnozzles extending through and con nected to the bottom of saidreceptacle, said nozzles communicating With the interior of saidreceptacle and connected with the said coupling, and pipes for supplyinga cyanid solution, com pressed air and water communicating rrith saidcoupling.

23. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by au overflow-compartment providedwith an outlet` a coupling, a series of screened nozzles communicatingwith said receptacle and connected With saidv coupling, and pipes forsupplying a cyanid solution, compressed air and water communicating Withsaid coupling.

24. An apparatus for extracting precious metals comprising a receptablehaving its upper portion surrounded by an overflow-compartment providedwith an out1et,a coupling, aseries of screened nozzles extending throughand connected to the bottom of said receptacle, said nozzlescommunicating With the interior of said receptacle and connected withthe said coupling, and pipes for supplying a cyanid solution, compressedair and Water communicating with said coupling.

25. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-cornpartment providedwith an outlet, a coupling, a series of nozzles communicating with saidreceptacle and connected with said coupling, pipes for supplying acyanid solution, compressed air and water communicating with saidcoupling, and means for controlling said pipes to conjointly supplycyanid solution and compressed air and separately supply water to eachof said nozzles.

26. An apparatus for extracting precious metals comprising a receptaclehavingits upper portion surrounded by an overflow-compartment providedWith an outlet, a coupling, a series of nozzles extending through andconnected to the bottom of said receptacle, said nozzles communicatingwith the inerior of said receptacle and connected with the saidcoupling, pipes for supplying a cyanid solution, compressed air andWater communicating with said coupling, and means for controlling saidpipes to conjointly supply cyanid solution and compressedair andseparately supply Water to each ot" said nozzles.

27. An apparatus for extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedWith an outlet, a coupling, a series of screened nozzles communicatingwith said coupling and said receptacle, pipes for supplying a cyanidsolution, compressed air and Water communicating with said coupling, andmeans for controlling said pipes to conjointly supply cyanid solutionand compressed air and separately supplying Water to each of saidnozzles.

2S. An apparatus for-extracting precious metals comprising a receptaclehaving its upper portion surrounded by an overflow-compartment providedwith an outlet, a coupling, a series of nozzles communicating with saidcompartment and with said coupling, pipes for supplying a cyanidsolution, compressed air and water communicating with said coupling,means for controlling said pipes to conjointly supply cyanid solutionand compressed air and separately supplying Water to each of saidnozzles, and an agitating means arranged Within and supported by the topof said receptacle.

29. An apparatus for extracting precious metals comprising a receptaclehaving its upperportion surrounded by an overflow-compartment providedwith an outlet, a coupling, a series of screened nozzles communicatingWith said receptacle and connected with said coupling, pipes forsupplying a cyanid solution, compressed air and communicating With saidcoupling, means for controlling said pipes to conjointly supply cyanidsolution and compressed air and separately supply Water to each of saidnozzles, and an agitating means arranged Within and supported by the topof said receptacle.

30. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening, a series of nozzles disposed throughout said bottom,connected thereto and communicating with the interior of saidreceptacle, and means connected with the nozzles and adapted to supplyconjointly a cyanid solution and compressed air and sepa- :rately supplyWater to each of said nozzles.

3l. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arranged outletopening and its upper portion surrounded by an overflow-compartmenthaving an outlet, a coupling, a series of nozzles disposed throughoutsaid bottom, connected thereto and communicating with the interior ofsaid receptacle, said nozzles further connected With said coupling,cyanid-solution, compressed-air and Water supply pipes communicatingwith said coupling, and means connected to the said pipes forcontrolling the supply of said solution, air and Water through saidcoupling.

32. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upperA portion surrounded by an overflow-compartment having an outlet, a coupling, a series of screened nozzlesdisposed throughout said bottom, connectedthereto and communicating withthe interior of4 said receptacle, said nozzles further connected withsaid coupling, cyanidsolution, compressed-air and water supply pipescommunicating with said coupling, andV ICO IIC

means connected to the said pipes for controlling the supply of saidsolution, air and a conical bottom havinga centrally-arrangedoutlet-opening and its upper portion surrounded by an overtlowcompartment having an outlet, a coupling, a series of nozzles disposedthroughout said bottom, connected thereto and communicating With theinterior of said receptacle, Said nozzles further connected with saidcoupling, pipes for supplying a cyanid solution, compressed air andwater communicating with said coupling, means connected to the saidpipes for controlling the supply of said solution, air and Water throughsaid coupling, and an agitating means arranged Within and supported bythe top of said receptacle.

35. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion surrounded by anoverflow-compartment having an outlet, a coupling, a series of screenednozzles disposed throughout said bottom, connected thereto andcommunicating with the interior of said receptacle, said nozzles furtherconnected with said coupling, pipes for supplying a eyanid solution,compressed air and water communicating with said coupling, meansconnected t-o the said pipes for controlling the supply of saidsolution, air and water through said coupling, and an agitating meansarranged Within and supported by the top of said receptacle.

36. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion snrrounded by an overfioW-chamberhaving an outlet, auxiliary supply-pipes arranged below the bottom ofsaid receptacle, a series of nozzles disposed throughout said bottom,communicating with the interior of said receptacle and connected to thetop of said pipes, a coupling attached to one end of said pipes, pipesfor supplying a cyanid solution, compressed air and Water communicatingWith said coupling, and means for controlling the supply of saidsolution, air and Water through said coupling and auxiliary supplypipesto said nozzles.

37. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion surrounded by an overflow-chamberhaving an outlet, auxiliary supply-pipes arranged below the bottomof-said receptacle, a series of screened nozzles disposed throughoutsaid bottom, communicating with the interior of said receptacle andconnected to the top of said pipes, a coupling attached to one end ofsaid pipes, means for supplying a cyanid solution, compressed air andwater supply pipes communicating with said coupling, and means forcontrolling the su pply of said solution, air and Water through saidcoupling and auxiliary supply-pipes to said nozzles.

38. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion surrounded by an overiioW-chamberhaving an outlet, auxiliary supply-pipes arranged below the bottom ofsaid receptacle, a series of nozzles disposed throughout said bottom,communicating with the interior of said receptacle and connected to thetop of said pipes, a coupling attached to one end of said pipes, meansfor supplying a cyanid solution, compressed air and Water communicatingWith said coupling, means for controlling the supply of said solution,air and Water through said coupling and auxiliary supply-pipes to saidnozzles, andan agitating means arranged within and supported by the topof said receptacle.

39. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion surrounded by an overiioW-chamberhaving an outlet, auxiliary supply-pipes arranged below the bottom ofsaid receptacle, a series of screened nozzles disposed throughout saidbottom, communicating With the interior of said receptacle and connectedto the top of said pipes, a coupling attached to one end of said pipes,means for supplying a cyanid solution, compressed air and Watercommunieating With said coupling, means for controlling the supply ofsaid solution, air and Water through said coupling and auxiliarysupplypipes to said nozzles, and an agitating means arranged within andsupported by the top of said receptacle.

40. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and its upper portion surrounded by an overiioW-chamberhaving an outlet, auxiliary supply-pipes arranged below the bottom ofsaid receptacle, a series of nozzles disposed throughout said bottom,projecting therethrough and connected there- With, said nozzlescommunicating with the interior of said receptacle and connected withsaid pipes, a coupling attached to one end of said pipes, means forsupplying a cyanid solution, compressed air and water communi- IOO IIO

eating with said coupling, means for controlling the supply of saidsolution, air and water, an agitating means arranged within andsupported by the top of said receptacle, and means communicating withthe outlet of said bottom and with said coupling for exhausting thesolution which remains in said receptacle.'

41. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and itsupper portion surrounded by an overflow-chamberhaving an outlet, a discharge-pipe communicating with said opening andprovided with a screen and a closure-valve, auxiliary supply-pipesarranged above the bottom of said receptacle, a series of nozzlesdisposed throughout said bottom, communicating with the interior of saidreceptacle and connected to said supplypipes, a coupling attached to oneend of said supply-pipes and provided with a trap, a pipe having acut-oit adapted to establish communication between the trap and saiddischargepipe, means for supplying a cyanid solution, compressed air andWater communicating with said coupling, and means for controlling thesupply ofsaid solution, air and water.

42. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arrangedoutlet-opening and at its upper portion surrounded by anoverflow-chamber having an outlet, a discharge-pipecommunicating Withsaid opening and provided with a screen and a closure-valve, auxiliarysupply-pipes arranged above the bottom of said receptacle, a series ofscreened nozzles disposed throughout said bottom, communicating with theinterior of said receptacle and connected to said supply-pipes, acoupling attached tofone end of said supply-pipes and' provided with atrap, a pipe having a cut-ott adapted to establish communication betweenthe trap and said discharge-pipe, means for supplying a cyanid solution,compressed air and water communicating with said coupling, and means forcontrolling the supply of said solution, air and water.

43. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having a centrally-arranged outletopening and its upper portion surrounded by an overflow-chamber havingan outlet, a discharge-pipe communicating with said opening and providedwith a screen and a closure-Valve, auxiliary supply-pipes arranged abovethe bottom of said receptacle, a series of nozzles disposed throughoutsaid bottom, communicating with the interior of said receptacle andconnected to said supplypipes, a coupling attached to one end of saidsupply-pipes and provided with a trap, a pipe having a cut-off adaptedto establish communication between the trap and said dischargepipe,means for supplying a cyanid solution, compressed air and watercommunicating with said coupling, means for controlling the supply ofsaid solution, air and water, and an agitating means arranged within andsupported by the top of said receptacle.

44. An apparatus for extracting precious metals comprising a receptacleprovided with an overow-compartment having an outlet, a series ofbodily-movable agitating-arms suspended in said receptacle and adaptedto be retained in their operative position when ro; tated in onedirection and to assume an i'noperative position when rotated in anopposite direction, a series of nozzles connected to the bottom of andcommunicating with the interior of said receptacle, means for supplyinga cyanid solution, compressed air and Water to each of said nozzles,either separately 0r in any preferred combination, and rotating meansfor said arms.

45. An apparatus for extracting precious metals comprisingareceptacle,aseries of bodily-movable agitating-arms suspended in saidreceptacle and adapted to be retained in their operative position whenrotated in one direction and to assume an inoperative position Whenrotated in an opposite direction, a series of nozzles connected to thebottom of and communicating with the interior of said receptacle, meansfor supplying a cyanid solution, compressed air and Water to each ofsaid nozzles, either separately or in any preferredcombination,androtatingmeans forsaidarms.

46. An apparatus for extracting precious metals comprisinga receptacle,aseries of bodily-movable agitating-arms suspended in said receptacleand adapted to be retained in their operative position when rotated inone direction and to assume an inoperative position when rotated in anopposite direction, a series of nozzles connected to the bottom of andlcommunicating with the interior of said receptacle, means for supplyinga cyanidsolution, compressed air and water to each of said nozzles,either separat-ely or in any preferred combination, rotating means forsaid arms, and means for changing the direction of movement of saidoperating means.

47. An apparatus for extracting precious metals comprising a receptacleprovided With an overflow-compartment having an outlet, a series ofbodily-movable agitating-arms suspended in said receptacle and adaptedto be retained in their operative position when rotated in one directionand to assume an inoperative position when rotated in an oppositedirection, a series of nozzles connected to the bottom of and communicatng with the interior of said receptacle, means for supplying acyanid solution, compressed air and Water to each of said nozzles,either separately or in any preferred combination, rotating means forsaid arms, and a chain secured to the lower end of each of said arms.

48. An apparatus for extracting precious metals comprising a receptacle,a series ot bodily-movable agitating-arms suspended in said I receptacleand adapted to be retained. in their IVO IIO

operative position and rotated in one direc-- tion and to assume aninoperative position when rotated in an opposite direction, a series ofnozzles connected to the bottom of and communicating with the interiorof said receptacle, means for supplying a cyanid solution, compressedair and Water to each of said nozzles, either separately or in anypreferred combination, rotating means for lsaid arms, and a chainsecured to the lower end of each of said arms.

49. An apparatus for extracting precious metals comprising a receptacleprovided with an overflow-compartment having an outlet, a series ofbodily-movable agitating-arms suspended in said receptacle and adaptedto be retained in their operative position when rotated in onedirect-ion and to assume an inoperative position When rotated in anopposite direction, a series of screened nozzles connected to the bottomof and communicating with the interior of said receptacle, means forsupplying a cyanid solution, compressed air and Water to each of saidnozzles, either separately or in any preferred combination, and rotatingmeans for said arms.

50. An apparatus for extracting precious metals comprising a receptacleprovided with an oVerdoW-compartment having an outlet, a series ofbodily-movable agitating-arms snspended in said receptacle and adaptedto 4be retained in their operative position when rotated in onedirection and to assume an inoperative position when rotated in anopposite direction, a series of screened nozzles connected to the bottomof and communicating with the interior of said receptacle, means forsupplying a cyanid solution, compressed air and water to each of saidnozzles, either separately or in any preferred combination, rotatingmeans for said arms, and means for changing the direction of movement ofsaid rotating means.

5l. An apparatus for extracting precious metals comprisingareceptacle,aseries of bodily-movable agitating-arms suspended in said receptacle andadapted to be retained in their operative position when rotated in onedirection and to assume an inoperative positionv when rotated in anopposite direction, a series of screened nozzles connected ,to thebottom of and communicating With the interior of said y receptacle,means for supplying a cyanid solution, compressed air and Water to eachof said nozzles, either separately or inany preferred combination,rotating means for said arms, and a chain secured to the lower end of ,yeach of said arms.

zles connected to the bottom of and communicating With the interior ofsaid receptacle, means for supplying a cyanid solution, compressed airand Water to each of said nozzles, either separately or in any preferredcombination, and rotating means for said arms.

53. An apparatus for extracting precious metals comprising areceptacle,a series of bodily-movable diamond-shaped agitating-armssuspended in said receptacle and adapted to be retained in theiroperative position when rotated in one direction and to assume aninoperative position When rotated in an opposite direction, a series ofscreened nozzles connected to the bottom of and communicating with theinterior of said receptacle, means for supplying a cyanid solution,compressed air and Water to each of said nozzles, either separately orin any preferred combination, and rotating means for said arms.

54. An apparatus for extracting precious metals com prising areceptacle,a series of bodily-movable, diamond-shaped agitating-armssuspended in said receptacle and adapted to be retained in theiroperative position when rotated in one direction and to assume aninoperative position When rotated in an opposite direction, a series ot'screened nozzles connected to the bottom ofand communicating with theinterior of said receptacle, means for supplying a cyanid solution,compressed air and Water'to each of said nozzles, either separately orinany preferred combination, rotating means forsaid arms, and means forchanging the direction of movementl of said operating means.

55. An apparatus for extracting precious metals comprising a receptacleprovided With a conical bottom having an outlet and its upper portionsurrounded by an overflow-compartment having an outlet, a series ofbodilymovable and loosely-mounted agitator-arms gradually decreasing inlength and adapted to be retained in their operative position whenrotated in one direction and to assume an inoperative position whenmoved in an opposite direction, a rotatable means for suspending saidarms Within said receptacle, a series of nozzles disposed throughout andconnected to said con-ical bottom and communicating with the interior ofsaid receptacle, means for supplying a cyanid solution, compressed airand Water to each of said nozzles either separately or in any preferredcombination, and operating means for said rotatable suspension means.

56. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having an outlet and its upper portionsurrounded by an overflow-compartment having an outlet, a series ofbodilymovable and loosely-mounted agitating-arms gradually decreasing inlength and adapted to be retained in their operative position Whenrotated in one direction and to assume an inoperative positionV whenmoved in an opposite direction, a rotatable means for sus-v IOO pendingsaid arms Within said receptacle, a series of screened nozzles disposedthroughout and connected tosaid conical bottom and communicating Withthe interior of said receptacle, means for supplying a cyanid solution,compressed air and water to each of said nozzles either separately or inany preferred combination, operating means for said rotatable suspensionmeans, and means for changing the direction of movement of saidoperating means. i

57. An apparatus for extracting precious metals comprising a receptacleprovided With a conical bottom having an outlet and its upper portionsurrounded by'an overflow-compartment having an outlet, a series ofbodily-movable and loosely-mounted diamondshaped agitating-armsgradually decreasing in length and adapted to be retained in theiroperative position when rotated in one direction and to assume aninoperative position when moved in an opposite direction, a rotatablemeans for suspending said arms within said receptacle, a series ofnozzles disposed throughout and connected to said conical bottom andcommunicating With the interior of said receptacle, means for supplyinga cyanid solution, compressed air and Water to each of said nozzleseither separately or in any preferred combination, operating means forsaid rotatable suspension means, and means for changing the direction ofmovement of said operating means.

58. An apparatus for extracting precious metals comprising a receptacleprovided with a conical bottom having an outlet and its upper portionsurrounded by an overflow-compartment having an outlet, a series ofbodilymovable and loosely-mounted agitator-arms gradually decreasing inlength and adapted to be retained in their operative position whenrotated in one direction and to assume an inoperative position Whenmoved in an opposite direction, a rotatable means for suspending saidarms within said receptacle, a series of nozzles disposed throughout andconnected to said conical bottom and communicating with the interior ofsaid receptacle, means for supplying a cyanid solution, compressed airand Water to each of said nozzles either separately or in any preferredcombination, operating means for said rotatable suspension means, andmeans communicating with said supply means and the outlet of said bottomfor exhausting the solution from said receptacle. y

59. An apparatus for extracting precious metals comprising a receptacleprovided with an outlet,a series of bodily movable and loosely-mou ntedagitating-arms gradually decreasing in length and adapted to be retainedin their operative position When rotated in one direction and to assumean inoperative position when moved in an opposite direction, a rotatablemeans for suspending said arms Within said receptacle, said rotatablemeans and arms bodily movable, a series of nozzles communicating withsaid receptacle, means for supplying a cyanid solution, compressed airand Water to each of said nozzles either separately or in any preferredcombination, and operating means for said rotatable means.

60. An apparatus for extracting precious metals comprising a receptacleprovided With an outlet, a series of bodily movable and loosely-mountedagitating-arms gradually decreasing in length and adapted to be retainedin their operative position When rotated in one direction and to assumean inoperative position when moved in an opposite direction, a rotatablemeans for suspending said arms Within said receptacle, said rotatablemeans and arms bodily movable, a series of nozzles communicating withsaid receptacle, means for supplying a cyanid solution, compressed airand Water to each of said nozzles either separately or in any preferredcombination, operating means for said rotatable means, and meanscommunicating with said supply means and the said outlet for exhaustingthe solution from said receptacle.

6l. An apparatus for extracting precious metals comprising a receptacleprovided With an outlet, a series of bodilymovable and loosely-mountedagitating-arms gradually decreasing in length and adapted to be retainedin their operative position when rotated in one direction and to assumean inoperative position when moved in an opposite direction, a rotatablemeans for suspending said arms Within said receptacle, said rotatablemeans and arms bodily movable, a series of screened nozzlescommunicating With said receptacle, means for supplying a cyanidsolution, compressed air and Water to each of said nozzles eitherseparately or in any preferred combination, operating means for saidrotatable means, and means communicating with said supply means and thesaid outlet for exhausting the solution from said receptacle.

62. An apparatus for extracting precious metals comprising a receptacle,a series of nozzles projecting therein and communicating therewith,means for supplying cyanid solution, compressed air and Water to each ofsaid nozzles either separately or in any preferred combination, andmeans for evenly distributing the compressed air and solution during thesupply thereof.

63. An apparatus for extracting precious metals comprising a receptacle,a coupling, a casing mounted on the coupling and forming acompressed-air chamber communicating with the interior of the coupling,a series of nozzles projecting in said receptacle and communicating withsaid coupling, and means communicating with said coupling and saidchamber for supplying toV said receptacle through the said nozzles acyanid solution, compressed air and Water either separately or in anypreferred combination.

64. An apparatus for extracting precious ICO IIO

IIC

ISC

metals comprising a receptacle, a series of screened nozzles projectingtherein and communicating therewith, means for supplying cyanidsolution, compressed air and water to each of said nozzles eitherseparately or in any preferred combination, and means for evenlydistributing the compressed air and solution during the supply thereof.

65. An apparatus for extracting precious metals comprising a receptacle,a coupling, a casing mounted on the coupling and forming acompressed-air chamber communicating with the interior of the coupling,a series of screened nozzles projecting in said receptacle andcommunicating with said coupling, and means communicating with saidcoupling and said chamber for supplying to said receptacle through thesaid nozzles a cyanid solution, compressed air and Water eitherseparately or in any preferred combination.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

HENRY H. THOMPSON.

Witnesses:

JAMES L. NoRRIs, Jr., N. LoUIs BOGAN.

